Finding the Fourth Proportional to 339,786.77, 509,681.78 and 103,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   339,786.77 : 509,681.78 = 103,131.50 : x
2. Step 2: Convert to fraction form
   339,786.77/509,681.78 = 103,131.50/x
3. Step 3: Cross multiply
   339,786.77x = 509,681.78 × 103,131.50
4. Step 4: Simplify right side
   339,786.77x = 52,564,245,978.41
5. Step 5: Solve for x
   x = 52,564,245,978.41/339,786.77
6. Step 6: Final answer
   x = 154,697.74